10 Unexpected Things Coffee Drinkers Would Probability Like To Know

7. The valve on the package

By pushing the valve, you can check the flavor of coffee and tell a fresh product from an old one, but it’s not its main function. The fact that there is a valve means that coffee was packed right after grinding and roasting. A pound of coffee gives off a lot of carbon dioxide after frying, so if there is no valve on the pack, it will explode.

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